Method of repairing shrouded turbine blades with cracks in the vicinity of the outer shroud notch

(19)

(11)

EP 1 892 374 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.06.2012 Bulletin 2012/26

(43)	Date of publication A2:
	27.02.2008 Bulletin 2008/09

(21)	Application number: 07253059.5

(22)	Date of filing: 03.08.2007

(51)

International Patent Classification (IPC):

F01D 5/00^(2006.01)
B23P 6/00^(2006.01)

F01D 25/28^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

(30)

Priority:

11.08.2006 US 503325

(71)	Applicant: United Technologies Corporation
	Hartford, CT 06101 (US)

(72)	Inventor:
	Milleville, Timothy A. Portland, CT 06480 (US)

(74)	Representative: Leckey, David Herbert
	Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)

(54)	Method of repairing shrouded turbine blades with cracks in the vicinity of the outer shroud notch

(57) A method of repairing a damaged notch fillet radius (20) of a turbine blade shroud (12) includes a replacement notch fillet radius (20) and a hardface nugget (30). The damaged notch fillet radius (20) is blended out and a hardface structure (22) positioned proximate the damaged notch fillet radius (20) is removed. A replacement notch fillet (20) radius is formed with weld filler and the hardface nugget (30) is welded to at least a portion of the replacement notch fillet radius (20).

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